Dental water heater



g- 13, 1929 R. A. MERCER 1,724,767

DENTAL WATER HEATER Filed April 13, 1928 2 Sheets-Sheet l INVENTOR ATTOR NEY Aug. 13, 1929. R. A. MERCER DENTAL WATER HEATER Filed April 13, 1928 2 Sheets-Sheet 2 ATTORNEY Patented Aug. 13, 1929.

UNITED STATES ROBERT A. MERCER, OF PHILADELPHIA, PENNSYLVANIA.

DENTAL WATER HEATER.

Application filed April 13, 1928.

The present invention relates to an improved water heater for use in dental parlors, the purpose being to eliminate the use of a bulb having a squirt nozzle, which is used for cleansing the cavity as it is drilled.

Another purpose is to provide a water heater including a heating coil, which 1s connected at one end to the water supply, and its other end terminating in a flexible tube, the extremity of which has a squirt nozzle, which normally rests on the side of the bowl on the dental chair, the nozzle lying partly in the bowl, and which nozzle has a valve normally open to permit the water to flow into the bowl, the construction and arrangement of the valve being such that when the dentist picks up the nozzle the valve may be operated to shut off the flow of water, and when the nozzle is placed in the patients mouth the valve releases and permits the water to flow.

Another purpose is to provide a housing for the coil and a heating element inserted in the coil having electrical connections with a source of current supply, thereby keeping the coil heated at all times, the electrical connections between the heating element and the current supply, including a conventional type of switch, which can be operated to shut off the current whenever desired.

It is to be understood that the particulars herein given are in no way limitive, and that while still keeping within the scope of the invention, any desired modification of details and proportions may be made in the construction of the appliance according to circumstances.

The invention comprises further features and combination of parts to be hereinafter set forth, shown in the drawings and claimed.

In the drawings Figure l is a view showing the application of the improved apparatus, with the squirt nozzle suspended over the side of the bowl so that the water will flow thereinto.

Figure 2 is a sectional View through the housing, longitudinal thereof, showing the heat element.

Figure 3 is a cross sectional view through the housing showing how the coil is supported therein.

-Figure 4 is a detailed sectional view through the squirt nozzle, showing the valve.

Referring to the drawings, 1 identifies a Serial No. 269,795.

housing which. may be made of any suitable material preferably sheet metal, and is provided with a hinge cover 2.

Bolted to the bottom of the housing interiorally thereof is a clamping support 3, which has a substantially semi-cylindrical seat 4 for the reception of the water receiving coil 5. This clamping support has central clamping jaws 6 which fit around the water receiving coil 7 and are bolted together by the bolt 8. One end of the coil 7 has a pipe 9 coupled at 10 to the coil, and this pipe 9 has a valve 9 for shutting water on and off. The other end of the coil terminates in a. couple 11, by which a flexible tube is connected to the coil. This flexible tube 12 operatively connects at 13 to a valve casing 14, which terminates in a squirt nozzle 15. A valve stem 16 is mounted in the casing 14 and carries a valve 17. Suitable guide walls 18 perforated at 19 are formed on the interior of the casing 14. These guide walls receive the stem 16, which carries the valve or stopper 17, which cooperates with one of the perforated walls 18 for shutting off the flow of water. A suitable spring 21 is mounted on the stem and interposed between one of the walls 18 and a shoulder 21 on the stem, thereby normally actuating the stem to hold the valve 17 out of contact with one of the perforated walls 18, thereby permitting the water to flow and discharge from the squirt nozzle. \Vhile the water is flowing in this manner the nozzle may be suspended under the side of the bowl carried by the dentists chair.

When the dentist desires to cleanse out a cavity subsequent to each drilling process it is possible to pick up the squirt and as soon as the operator grasps it, the head of the stem may be actuated to close the valve and keep it closed until the discharge end of the squirt nozzle is in the patients month, then the head of the stem may be released allowing hot water to enter the cavity. The valve can be operated as desired to shut the water on and off.

The water receiving coil in the housing may be of such diameter as to receive a conventional type of heating element 22, which has a surrounding casing 23, there being an electrical cord connection 24 for the heating element so that the electrical cord connection can be attached to any well known socket to receive electrical supply. The cord has a well two binding posts, 2 and 2 and one side of the electric cord connection 24 is connected by a lead or wire 3 to the binding post 2 while the other side of the electric cord connection 24 is connected by a lead or wire 4 to the binding post 2 hence it will be noted that when the heating coil on the interior of the housing is generating excessive heat, the thermostatic control will operate to open or break the circuit and-therefore shut off current to the heating coil. In this manner there is no chance for the heating coil becoming overheated, and hence the water will not become excessively heated and therefore the heating of the water will be automatically controlled.

The invention having been set forth, what is claimed is:

1. In a dental water heater, a housing, a support having a semi-cylindrical seat, a water receiving coil engaging said seat, said support having clamps to retain the coil in position, a heating element mounted in the coil, one end of the coil having connections ,with a water supply, and a flexible tube connected to the other end of the coil and provided with a squirt nozzle having a normally opened valve.

2. In a dental water heater, a water receiving coil having an internally arranged heating element, means to connect a water supply to one end of the coil, a flexible hose connected to the other end of the coil and provided with an outlet squirt nozzle, a housing for the coil and having a clamping support to retain the coil in position, said squirt nozzle having a normally opened valve, the closing of which shuts off the flow of water during the time the nozzle is lifted from the dental bowl to the patients mouth;

3. In a dental water heater, a water receiving coil having an internally arranged heating element, means to connect a water supply retain the coil in position, said squirt nozzle having a normally opened valve, the closing of which shuts off the flow of water during the time the nozzle is lifted from the dental bowl to the patients mouth, and means to open or break the circuit, and therefore shut off current to the electric heating element.

4. In a dental water heater, a housing, a pair of U-shaped supports secured to one side of the housing internally thereof, said supports having semi-cylindrical seats, a water receiving coil having an internally arranged heating element, the coil engaging with said seats, a split clamp connected tothe adjacent ends of the seats of the supports and engaged about the water receiving coil, with means to connect the split ends of the clamp to prevent longitudinal movement of the water receiving coil, means to connect a water supply to one end of the coil, a flexible hose connected to the other end of the coil and provided With an outlet squirt nozzle, said nozzle having a normally opened valve, the closing of which shuts off the flow of water during the time the nozzle is lifted to the dental bowl to the patients mouth.

5. In a dental water heater, the combination with a housing, of a water receiving coil in the housing, means to support the water receiving coil from one side of the housing internally thereof, said'water receiving coil having an internally arranged heating element, said heating element adapted to pass through one end of the housing, and slide into the coil, with means to fasten the heating element in position, a hose connected to one end of the coil and having an outlet squirt nozzle, a connection from a water supply passing through the hose and attached to the other end of the coil, the heating element including an electric circuit, with means in the circuit for opening and closing the same therefore controlling the current to theelrctric heating element.

In testimony whereof he affixes his signature. 7

ROBERT A. ltllillltlt'll. 

